CODEWITHSUNDEEP
clinuxlinux-device-driverpci
Amit Singh Tomar
Amit Singh Tomar

Reputation: 8608

Unable to open /sys/bus/pci/devices/0000:00:01.0/resource

I am trying to open an absolute path of a PCI device in C code

 fd = open("/sys/bus/pci/devices/0000:00:01.0/resource", O_RDWR);

 if (fd < 0) {
            printf("Not found %s\n", path);
            return -1;
    }

But it gives me an error saying Not found /sys/bus/pci/devices/0000:00:01.0/resource

Can anyone please point me out what I am doing here?

Upvotes: 0

Views: 3203

Answers (1)

John Zwinck
John Zwinck

Reputation: 249642

You are trying to open the path for read/write, but it is only readable (that's what the -r--r--r-- in ls -l output means). You'll need to change O_RDWR to O_RDONLY.

Upvotes: 2

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